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AD820:  Single-Supply, Rail-to-Rail, Low Power FET-Input Op Amp

Product Details


The AD820 is a precision, low power FET input op amp that can operate from a single supply of 5 V to 36 V, or dual supplies of ±2.5 V to ±18 V. It has true single-supply capability, with an input voltage range extending below the negative rail, allowing the AD820 to accommodate input signals below ground in the single-supply mode. Output voltage swing extends to within 10 mV of each rail, providing the maximum output dynamic range.

Offset voltage of 800 μV maximum, offset voltage drift of 2 μV/°C, typical input bias currents below 25 pA, and low input voltage noise provide dc precision with source impedances up to 1 GΩ. 1.8 MHz unity gain bandwidth, −93 dB THD at 10 kHz, and 3 V/μs slew rate are provided for a low supply current of 800 μA. The AD820 drives up to 350 pF of direct capacitive load and provides a minimum output current of 15 mA. This allows the amplifier to handle a wide range of load conditions. This combination of ac and dc performance, plus the outstanding load drive capability, results in an exceptionally versatile amplifier for the single-supply user.

The AD820 is available in two performance grades. The A and B grades are rated over the industrial temperature range of −40°C to +85°C. The AD820 is offered in three 8-lead package options: plastic DIP (PDIP), surface mount (SOIC) and (MSOP).

Applications

  • Battery-powered precision instrumentation
  • Photodiode preamps
  • Active filters
  • 12-bit to 14-bit data acquisition systems
  • Medical instrumentation
  • Low power references and regulators
  • Data Sheet, Rev. F, 11/08

    FEATURES and BENEFITS

    • True single-supply operation
      Output swings rail-to-rail
      Input voltage range extends below ground
      Single-supply capability from 5 V to 36 V
      Dual-supply capability from ±2.5 V to ±18 V
    • Excellent load drive
      Capacitive load drive up to 350 pF
      Minimum output current of 15 mA
    • Excellent ac performance for low power
      800 μA maximum quiescent current
      Unity-gain bandwidth: 1.8 MHz
      Slew rate of 3 V/μs
    • Excellent dc performance
      800 μV maximum input offset voltage
      2 μV/°C typical offset voltage drift
      25 pA maximum input bias current
    • Low noise: 13 nV/√Hz @ 10 kHz

    Pin Diagrams

    Documentation

    Title Content Type File Type
    AD820: Single-Supply, Rail-to-Rail, Low Power, FET-Input Op Amp Data Sheet  (Rev H, 03/2011) (pdf, 582 kB) Data Sheets PDF
    AN-649: Using the Analog Devices Active Filter Design Tool  (pdf, 5301 kB) Application Notes PDF
    AN-106: A Collection of Amp Applications  (pdf, 1094 kB)
    Examines Some of the Numerous and Widely Used Applications of the Operational Amplifier
    Application Notes PDF
    AN-358: Noise and Operational Amplifier Circuits  (pdf, 593 kB) Application Notes PDF
    Low-Power, Low-Voltage IC Choices for ECG System Requirements
    (Analog Dialogue, Vol. 29, No. 3, 1995)
    Technical Articles HTML
    Low-Power, Low-Voltage IC Choices for ECG System Requirements
    (Analog Dialogue, Vol. 29, No. 3, 1995)
    Analog Dialogue HTML
    Very Low Voltage, Micropower Amplifiers (V, (S)< 3 V, I(SY) < 500 µA) Choosing and Using Them
    (Analog Dialogue, Vol. 29, No. 3, 1995)
    Analog Dialogue HTML
    RAQs index Rarely Asked Questions HTML
    What do I do with the "null pins" on the amplifier if I don't plan to use them? FAQs/RAQs HTML
    Glossary of EE Terms Glossary HTML

    Design Tools,Models,Drivers & Software

    Title Content Type File Type
    AD820 SPICE Macro-Model SPICE Models HTML

    Evaluation Kits & Symbols & Footprints

    Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

    Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

    SampleSample & Buy

    Price, packaging, availability

    AD820 Model Options
    Model Package Pins Temp.
    Range
    Packing,
    Qty
    Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
    Purchase/Sample
    AD820ANZ Status: Production 8 ld PDIP 8 Ind Tube, 50 $2.07 $1.86 Y  Material Info PCN Purchase
    AD820AR Status: Production 8 ld SOIC 8 Ind Tube, 98 $2.35 $2.11 N  Material Info Notify Me Purchase
    AD820AR-REEL Status: Production 8 ld SOIC 8 Ind Reel, 2500 - $2.11 N  Material Info Notify Me Purchase
    AD820AR-REEL7 Status: Production 8 ld SOIC 8 Ind Reel, 750 $2.35 $2.11 N  Material Info Notify Me Purchase
    AD820ARMZ Status: Production 8 ld MSOP 8 Ind Tube, 50 $2.02 $1.82 Y  Material Info PCN Purchase Sample
    AD820ARMZ-R7 Status: Production 8 ld MSOP 8 Ind Reel, 1000 - $1.82 Y  Material Info PCN Purchase
    AD820ARMZ-RL Status: Production 8 ld MSOP 8 Ind Reel, 3000 - $1.82 Y  Material Info PCN Purchase
    AD820ARZ Status: Production 8 ld SOIC 8 Ind Tube, 98 $2.02 $1.82 Y  Material Info Notify Me Purchase Sample
    AD820ARZ-REEL Status: Production 8 ld SOIC 8 Ind Reel, 2500 - $1.82 Y  Material Info Notify Me Purchase
    AD820ARZ-REEL7 Status: Production 8 ld SOIC 8 Ind Reel, 750 $2.02 $1.82 Y  Material Info Notify Me Purchase
    AD820BR Status: Production 8 ld SOIC 8 Ind Tube, 98 $3.42 $3.08 N  Material Info Notify Me Purchase
    AD820BR-REEL Status: Production 8 ld SOIC 8 Ind Reel, 2500 - $3.08 N  Material Info Notify Me Purchase
    AD820BRZ Status: Production 8 ld SOIC 8 Ind Tube, 98 $2.96 $2.66 Y  Material Info Notify Me Purchase
    AD820BRZ-REEL Status: Production 8 ld SOIC 8 Ind Reel, 2500 - $2.66 Y  Material Info Notify Me Purchase
    AD820BRZ-REEL7 Status: Production 8 ld SOIC 8 Ind Reel, 750 $2.96 $2.66 Y  Material Info Notify Me Purchase
    Price Table Help

    The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

    EVAL-OPAMP-1 Evaluation Board
    Model Description Price RoHS View PCN/ PDN Check Inventory/
    Purchase/Sample
    EVAL-PRAOPAMP-1KSZ Status: Production Single KS-5 lead SC70 Evaluation Board $20.19 Yes -
    EVAL-PRAOPAMP-1RJZ Status: Production Single RJ-5 lead SOT23 Evaluation Board $20.19 Yes -
    EVAL-PRAOPAMP-1RMZ Status: Production Single RM-8 lead MSOP Evaluation Board $20.19 Yes -
    EVAL-PRAOPAMP-1RZ Status: Production Single R-8 lead SOIC Evaluation Board $20.19 Yes -

    Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

    Check Inventory & Purchase

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